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Media Gateway Control and the Softswitch Architecture
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Media Gateway Control and the Softswitch Architecture
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information can include such items as the current value of RequestedEvents, the current value of DigitMap, or the current value of NotifiedEntity This parameter should not be confused with the RequestedEvents parameter
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RequestIdentifier (X) Used in RQNT and NTFY commands to identify a particular request for information The purpose of the parameter is to enable a call agent to correlate a given notification from a gateway with a particular notification request previously sent from the call agent to the gateway ResponseAck (K) A list of one or more transaction ID ranges RestartDelay (RD) A number of seconds indicating when an endpoint will be brought back into service RestartMethod (RM) Used to indicate whether a restart at an endpoint is graceful (existing connections are not terminated) or forced (existing connections are terminated) This parameter is also used to indicate that an endpoint is about to be brought back into service after a specified delay SecondConnectionId (I2) Connection identifier associated with the connection on a second endpoint When a command, such as CreateConnection, specifies a second endpoint, then actually two connections are created Each has its own identifier and each may be manipulated through commands such as ModifyConnection SecondEndpointID (Z2) Used to indicate a second endpoint on the same gateway This would apply when a call agent wants to create a connection between two endpoints on the same gateway It can be used in the command to specify the second endpoint to be included in the connection Its use in a command may include the use of the any ($) wildcard In such a case, the parameter will also be used in the response to the command to indicate the specific endpoint chosen as the second endpoint SignalRequests (S) Signals to be applied by an endpoint to the media stream, such as a ring tone or dial tone SpecificEndpointID (Z) Used to indicate a single endpoint, particularly in a response to a command where a wildcard was used by the call agent For example, when creating a connection using CRCX, the call agent might not care exactly which endpoint is used for the connection and might let the gateway make the choice In such a case, the gateway would respond to the CRCX command and would use this parameter in that response to indicate the identity of the exact endpoint chosen
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Media Gateway Control and the Softswitch Architecture
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Not all parameters will appear in all commands Rather, for each command, certain parameters are mandatory, certain parameters are optional, and certain parameters are forbidden Table 6-1 shows the mapping of command parameters to commands, where M mandatory, O optional, and F Forbidden
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Overview of MGCP Responses
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For each MGCP command, a response is returned Responses are comprised of a response line, optionally followed by a number of response parameters The response line is made up of a return code, followed by the transaction identifier, optionally followed by a commentary or reason phrase Each of these is separated by a single space (SP) character and the response line is terminated by a carriage return line feed (CRLF) and may be represented as
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Return code SP TransactionID SP Commentary CRLF
A return code is an integer value Return codes are divided into the following categories:
0XX (000 to 099) This indicates an acknowledgement to a response 1XX (100 to 199) Provisional responses A final response will follow later 2XX (200 to 299) The command successfully completed 4XX (400 to 499) Failure due to a transient error 5XX (500 to 599) Failure due to a permanent error 8XX (800 to 899) Package-specific responses
Table 6-2 gives a complete listing of the return codes defined in MGCP and their meanings A response must be correlated with the command that triggered the response Therefore, the TransactionId appears in both commands and responses The response to a command will use the same TransactionId as the command that generated the response The same parameters that are available for use in MGCP commands are also available for use in MGCP responses The allowed usage in responses differs from the allowed usage in commands, however For example, the LocalConnectionOptions parameter is an optional parameter in a CRCX command, but is forbidden in a response to a CRCX command Table 6-3 provides a mapping of response parameters to the commands that generate
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Table 6-1
Command parameters and commands (as specified in proposed update to RFC 2705)
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